By 1954, the Temagami Mining Company Limited was soon incorporated to run this project on August 1954. Before it became the newly formed corporation it had went through an amalgamation of its present company which was the Temagami Mining Company, and the Derosier Nickel and Copper Mines. Within December of 1964, another change was made when company decided to go into a consolidation with the Goldfields Mining Corporation. This was commonly known as the change that had made the two companies form the Copperfields Mining Corporation Limited.

During this time period the company had a whack of leased mineral rights within Temagami Island, and the townships of Briggs, Joan, Yates, Phyllis and not least Scholes Township. They immediately decided to form the legendary Copperfields Mine as it represented a true meaning for the company. Additionally the company had about 7,223 acres of mineral leased land that totalled 185 claims in total. It was reported that the newly formed company had constantly worked the milling operations throughout 1968.

As development was under way the company had originally commenced more construction phases on its Vertical Four Compartment No. 1 shaft operation that was located in Phyllis Township. It was reported to have been leased under claim No. 11446, and had its very own depth of 2,079 feet. Further development by the company had included 4,797 feet of drifting, 2,810 feet of crosscutting, and 2,595 feet of raising was done in 1968. By the end of 1968, the company was pretty much well off as it had now completed a total of 49,047 feet of drifting, 10,185 feet of crosscutting, and 11,712 feet of raising. Company officials from the Copperfields Mining Corporation Limited had additionally explored the claim with a series of 503 feet of diamond drilling. This whole entire exploratory phase had soon completed 80,792 feet of underground diamond drilling, and another 77 holes totalling 20,339 feet from surface explorations. As the mine slowly started to boom again the company was now on another mission when it completed 60 feet of trenching that was only 3 feet deep at the time. The Copperfields Mining Corporation Limited had also decided to construct other structures that included the ventilation building, another addition to the Dry building, and its very own residence. By that time it was installing all the required machinery to actually run this magnitude mining operation. These things had included 1 air compressor, 1 locomotive for the underground workings, a B12 Loader, 1 mine air heater, and two newly purchased cars. Production from the mining operation was rather steady as it had hoisted a total of 50,330 tons of ore from the Copperfields Mine. In general being this had totalled about 199 tons of ore that was to be processed on a daily basis. Company officials that whole entire year had processed more than 50,000 tons of ore from the mine site.

Within the following year, the Copperfields Mine was still in production throughout 1969, and had its own milling facility running smoothly. However some delays had occurred as the company had went through a struggling strike battle that lasted from February to April 1969. It was reported that the strike was caused due to low budgeting by the United Steelworkers of America. This whole entire struggling battle had also produced a low quantity of ore within that year alone. Ore production from the on-site mill was said to have only produced 41,136 tons of ore. Not to mention the ore that was hoisted from the mine was also considered to be low in grade. Mean while the company had other plans under its belt when they decided to go after a much higher grade ore body that was marked as the No. 3 ore body. However this was not considered to be an easy task as the ore-body alone was found beneath Temigami Lake. This massive project would included the engineered of a cofferdam that was being completed over the ore body. If this strategy was to succeed the company would have an easier way of getting the water away from the Ore body that was present along the lake bed. Once the full scale production becomes completed it was than reported that the damned area would be donated as a fishing pond to the Temagami Lakes Association.

Almost all development was being aimed at depending the No. 1 vertical four compartment shaft operation which was being leased. In addition the Copperfields Mining Company Limited had decided to sink the shaft to another 451 feet, and it had now been collared to about 2,535 feet within the solid barring rock. All production was reported to have been taken from the newly station levels that we're found on the mines 2,375 foot levels, and the 2,425 foot loading pocket that was constructed within 1969.

Mining operations at the Copperfield Mine had additionally comprised of 6,708 feet of drifting, 1,381 feet of crosscutting, and 937 feet of raising. By the end of 1969, the mine was already experiencing a major lateral development that totalled 79,985 feet. Company officials from the Copperfields Mining Company Limited would also do further explorations by conducting 479 diamond drill holes. This whole entire exploration procedure had soon totalled 73,907 feet of underground drilling, and 21,182 feet of surface drilling.

Another huge exploration was to be completed in hopes of find Copper-Nickel ore on a separate pyrite zone. This whole entire exploration procedure was rather referred as the Pyritic Zone Project. It was believe to be tested because copper and nickel markets we're rather up high within the markets. In nature this historical exploration procedure would soon discovered a continuous band of sulphides which was said to have followed the Metadiorite-Rhyolite contact throughout the whole entire mining operation. Within this time period two drilling procedure had soon outlined a total of 770,000 tons of continuous production. Drilling phases within this contact zone had been traced to the 1,975 foot section of this mining operation. A total of 112 men became reported to have been hired by the company to work this historical mining project. However the ore body beneath the lake had proven to be to dangerous to work on as the lake had constantly flooded in the workings. So nevertheless, the Copperfield Mine or the Temagami Mine was reported to have officially closed down by 1969. A total production of 230,028 tons of silver, 13,271 ounces of gold, and 80 million pounds of Copper was mined from its own mine production life.